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现代地质 ›› 2012, Vol. 26 ›› Issue (2): 308-316.

• 构造地质学 • 上一篇    下一篇

东秦岭—大别造山带南、北缘晚白垩世以来构造演化的石英ESR年代学研究

 李学刚1, 杨坤光1,2, 王军1   

  1. 1 中国地质大学 地球科学学院,湖北 武汉430074; 2 中国地质大学 构造与油气资源教育部重点实验室,湖北 武汉430074
  • 收稿日期:2011-10-26 修回日期:2012-02-20 出版日期:2012-04-20 发布日期:2018-09-19
  • 通讯作者: 杨坤光,男,教授,博士生导师, 1954年出生,构造地质学专业,主要从事构造地质学研究。
  • 作者简介:李学刚,男,硕士研究生, 1985年出生,构造地质学专业,主要从事构造地质学研究。Email: 01105413@163.com。
  • 基金资助:

    国家自然科学基金项目(40972137);中国石化重大基础研究项目“ 中国南方中上扬子大陆构造与海相油气前景”; 国土资源部油气资源战略研究中心专项“ 南华北地区中新生代叠加构造变形与油气保存条件研究”(XQ-2007-02-3-2)。

Structural Evolution of Northern and Southern Edges of East Qinling-Dabie Orogenic Belt:Evidence from ESR Dating

 LI  Hua-Gang-1, YANG  Kun-Guang-1,2, WANG  Jun-1   

  1. 1 Faculty of Earth Sciences,China University of Geosciences, Wuhan,Hubei430074, China; 2 Key Laboratory of Tectonic and Petroleum Resources of Ministry of Education, China University of Geosciences, Wuhan,Hubei430074,China
  • Received:2011-10-26 Revised:2012-02-20 Online:2012-04-20 Published:2018-09-19

摘要:

运用α石英热活化ESR定年法对东秦岭—大别造山带南、北缘58件样品进行了研究。结果显示,东秦岭—大别造山带南、北缘ESR年龄范围主要集中在晚白垩世以来(99.2~3.4 Ma)。结合区域地质事实分析,晚白垩世以来,东秦岭—大别造山带南缘的构造演化可划分为731~52.3 Ma伸展断陷期、39.1~27.2 Ma伸展-挤压的转换期和22.8~3.4 Ma挤压期;东秦岭—大别造山带北缘的构造演化可划分为89~70.1 Ma挤压隆升期、61.6~43.2 Ma伸展断陷期、37.2~22.6 Ma伸展-挤压的转换期和15.6~3.9 Ma挤压期。东秦岭—大别造山带南缘和北缘新生代构造演化特征基本相同,但是受多种因素控制,东秦岭—大别造山带南、北缘晚白垩世的构造演化存在较大差异。ESR测年结果与东秦岭—大别造山带南、北缘已有的地质事实相吻合,验证了ESR测年的可靠性。

关键词: 东秦岭&mdash, 大别造山带, ESR测年, 新生代, 构造演化

Abstract:

Fifty eight samples from tectogenetic α quartz veins in northern and southern edges of East Qinling-Dabie orogenic belt were studied by the use of ESR dating method.The results show that the ESR ages of α quartz veins  mainly change between 99.2  and 3.4 Ma Combined ESR dating results with other geological evidences,it comes to the conclusion as follows:after Late Cretaceous,the evolution history of southern edge of East Qinling-Dabie orogenic belt has experienced extending and faulted depression stage(73.1-52.3 Ma),extending.squeezing transformation stage(39.1-27.2 Ma) and squeezing stage(22.8-3.4 Ma); the evolution history of northern edge of East Qinling-Dabie orogenic belt has experienced squeezing uplift stage(89-70.1 Ma), extending and faulted depressions stage(61.6-43.2 Ma), extending  squeezing transformation stage(37.2-22.6 Ma) and squeezing stage(15.6-3.9 Ma).Northern and southern edges of East Qinling-Dabie orogenic belt have similar tectonic evolution characteristics in Cenozoic. But affected by several factors, the tectonic evolution of northern and southern edges of East Qinling-Dabie orogenic belt are obviously different in Late Cretaceous.The ESR dating results are consistent with geological evidences,which checks up the dependability of ESR dating.

Key words: East QinlingDabie orogenic belt, ESR dating, Cenozoic, tectonic evolution